661330343 has 4 divisors (see below), whose sum is σ = 673808328. Its totient is φ = 648852360.

The previous prime is 661330331. The next prime is 661330367. The reversal of 661330343 is 343033166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 661330343 - 2¹⁴ = 661313959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661330303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6238913 + ... + 6239018.

It is an arithmetic number, because the mean of its divisors is an integer number (168452082).

Almost surely, 2^661330343 is an apocalyptic number.

661330343 is a deficient number, since it is larger than the sum of its proper divisors (12477985).

661330343 is a wasteful number, since it uses less digits than its factorization.

661330343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12477984.

The product of its (nonzero) digits is 11664, while the sum is 29.

The square root of 661330343 is about 25716.3438886635. The cubic root of 661330343 is about 871.2433637817.

The spelling of 661330343 in words is "six hundred sixty-one million, three hundred thirty thousand, three hundred forty-three".